[chirp_users] Can't install on Ubuntu 23.04

[David Spoelstra]

I'm following these instructions:
https://chirp.danplanet.com/projects/chirp/wiki/ChirpOnLinux

$ pip3 install chirp-20230425.tar.gz
error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
    python3-xyz, where xyz is the package you are trying to
    install.

    If you wish to install a non-Debian-packaged Python package,
    create a virtual environment using python3 -m venv path/to/venv.
    Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
    sure you have python3-full installed.

    If you wish to install a non-Debian packaged Python application,
    it may be easiest to use pipx install xyz, which will manage a
    virtual environment for you. Make sure you have pipx installed.

    See /usr/share/doc/python3.11/README.venv for more information.

note: If you believe this is a mistake, please contact your Python
installation or OS distribution provider. You can override this, at the
risk of breaking your Python installation or OS, by passing
--break-system-packages.
hint: See PEP 668 for the detailed specification.

So I tried pipx:
$ pipx install chirp-20230425.tar.gz
Fatal error from pip prevented installation. Full pip output in file:
    /home/david/.local/pipx/logs/cmd_2023-04-25_11.52.02_pip_errors.log

Some possibly relevant errors from pip install:
    ERROR: Could not find a version that satisfies the requirement
chirp-20230425-tar-gz (from versions: none)
    ERROR: No matching distribution found for chirp-20230425-tar-gz

Error installing chirp-20230425-tar-gz.

Any ideas?
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